Lesson 3

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1. Lesson 3

Mathematics 30-3 Module 3

Module 3: Algebra


Lesson 3: Scatterplots and Linear Trends



This is a photograph of a person holding a cellphone with a design containing concentric circles in the background.

© Chlorophylle/4776576/Fotolia

We often hear in the news that some product is linked with an increased risk of health issues.


On May 31, 2011, the World Health Organization warned the public that the radiofrequency electromagnetic fields associated with the use of wireless phones increases the risk of glioma, a malignant type of brain cancer. 


Have you ever noticed that it is seldom said that the product actually causes health problems? Instead, these warnings usually indicate that an item or product increases the risk of health problems. How are these risks being determined, if they are not an absolute cause?


In this lesson you will learn about how to compare two variables and determine if there is a correlation between them.


Lesson Outcomes


At the end of this lesson you will be able to

  • create, with or without technology, a graph to represent a data set, including scatterplots
  • describe the trends in the graph of a data set, including scatterplots
  • construct a line of best fit for a scatterplot
Lesson Questions

You will investigate the following questions:

  • How does a line of best fit relate to the correlation of two variables?
  • What are the uses and limitations of a line of best fit?


Your assessment may be based on a combination of the following tasks:

  • completion of the Lesson 3 Assignment (Download the Lesson 3 Assignment and save it in your course folder now.)
  • course folder submissions from Try This and Share activities
  • additions to Glossary Terms
  • work under Project Connection
Materials and Equipment


You will need